ex_atan2.nxc

This is an example of how to use the atan2 function.

// ex_atan2.nxc
// Display values of the atan2 API call.
// This program runs indefinitely -- press gray button to exit.
// Reguires enhanced firmware 1.28 or later.

// The following two arrays comprise the x and y coordinates of the corners and 
// the mid-points of the sides of a square centered at the origin and having 
// sides two units long.
const float y_coord[] = {-1.0, -1.0, -1.0, 0.0, 1.0, 1.0,  1.0,  0.0};
const float x_coord[] = {-1.0,  0.0,  1.0, 1.0, 1.0, 0.0, -1.0, -1.0};

// Display the angles made by lines from the origin to the points on the square 
// as specified above.
task main()
{
   const int pts = ArrayLen(y_coord);
   for (int i = 0; i < pts; ++i)
   {
      float angle = atan2(y_coord[i], x_coord[i]);
      TextOut(0, 56 - 8 * i, FormatNum("%7.4f RAD", angle));
   }
   while (true);
}